Spin-resonance modes of the spin-gap magnet TlCuCl_3

Details Spin-resonance modes of the spin-gap magnet TlCuCl_3 Spin-resonance modes of the spin-gap magnet TlCuCl_3

2003-11-11

arxiv.org/abs/cond-mat/0311243v2

Physical Review B 69, 184410 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

v.2: typo correction (one of the field directions was misprinted in the v.1)

Scientific paper

10.1103/PhysRevB.69.184410

Three kinds of magnetic resonance signals were detected in crystals of the spin-gap magnet TlCuCl_3. First, we have observed the microwave absorption due to the excitation of the transitions between the singlet ground state and the excited triplet states. This mode has the linear frequency-field dependence corresponding to the previously known value of the zero-field spin-gap of 156 GHz and to the closing of spin-gap at the magnetic field H_c of about 50 kOe. Second, the thermally activated resonance absorption due to the transitions between the spin sublevels of the triplet excitations was found. These sublevels are split by the crystal field and external magnetic field. Finally, we have observed antiferromagnetic resonance absorption in the field-induced antiferromagnetic phase above the critical field H_c. This resonance frequency is strongly anisotropic with respect to the direction of the magnetic field.

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